I suggest that the official team revise the content of this prompt, as ignoring the current warning still results in the error message “Error: WEB_DOMAINS limit is met::upgrade user package.”
Here is the reference content:
Due to security reasons, Hestia currently does not support creating new Web services under administrator privileges. If you need to set up new network services, please create a new user account under the user and proceed with deploying your web hosting service program.
That’s because by default user admin is using package system and this package has a limit of 1 web domains. If you want to ignore the warning and add more web domains, mail domains, backups, etc. create a new package raising the limit of web domains, mail domains, backups, etc. and assign that package to admin user.